function xdeltanstCOMFn = deltanstCOMFn(x)
xdeltanstCOMFn = (-505129786708075980 - 3577163401231118908009*x(1) -  ...
  3619110006036142829044*x(2) - 4027064042537472745011*x(3) +  ...
  4003067969216610422396*x(4) + 2502076329480406035335*x(5))/ ...
 3577163329901946072409 ...
;